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run code in 200+ php & hhvm versions
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<?hh // decl namespace { class Z_TRAIT_IMPL implements Z { } interface Z {} }
based on YKrLn
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.1.7
Parse error: syntax error, unexpected 'namespace' (T_NAMESPACE) in /in/9UDjS on line 3
Process exited with code 255.
Output for hhvm-3.15.4